I'm not especially bothered, but it is nice that someone is piecing together an accurate history instead of simply adding to the 'Gary Fisher, Joe Breeze and their chums from down the allotment invented the mountain bike' version, which was close to becoming the accepted history, even with pundits who should know better.
And like Apps, some of us were mucking about with our home built tracker bike in the 60's and 70's, and while 700c wasn't around then I'm pretty sure I didn't imagine us spottiebums jealously coveting 27 x 1-1/2 chunky touring tyres for our cow-horned-bar specials, a size actually bigger in diameter that 700c 29ers. For what it's worth I personally invented off road DH riding instead of the early version of trail riding favoured by my fellow yank-beaters. Many a happy day on my Triumph tracker.
I also invented the 69'er, or at least the concept - one day I acquired a puncture and had no means to fix it, so somehow fitted a chopper rear wheel to my Triumph, even going as far as grafting on a Sturmey thumbie. A thing of insane beauty to behold, even if my feet did hit the floor with every pedal stroke...